using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif
using System.Reflection;

[System.AttributeUsage(System.AttributeTargets.Field)]
public class InspectorButtonAttribute : PropertyAttribute
{
	public static float kDefaultButtonWidth = 80;
	
	public readonly string MethodName;
	
	private float _buttonWidth = kDefaultButtonWidth;
	public float ButtonWidth
	{
		get { return _buttonWidth; }
		set { _buttonWidth = value; }
	}
	
	public InspectorButtonAttribute(string MethodName)
	{
		this.MethodName = MethodName;
	}
}

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(InspectorButtonAttribute))]
public class InspectorButtonPropertyDrawer : PropertyDrawer
{
	private MethodInfo _eventMethodInfo = null;
	
	public override void OnGUI(Rect position, SerializedProperty prop, GUIContent label)
	{
		InspectorButtonAttribute inspectorButtonAttribute = (InspectorButtonAttribute)attribute;
		Rect buttonRect = new Rect(position.x + (position.width - inspectorButtonAttribute.ButtonWidth) * 0.5f, position.y, inspectorButtonAttribute.ButtonWidth, position.height);
		if (GUI.Button(buttonRect, label.text))
		{
			System.Type eventOwnerType = prop.serializedObject.targetObject.GetType();
			string eventName = inspectorButtonAttribute.MethodName;
			
			if (_eventMethodInfo == null)
				_eventMethodInfo = eventOwnerType.GetMethod(eventName, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
			
			if (_eventMethodInfo != null)
				_eventMethodInfo.Invoke(prop.serializedObject.targetObject, null);
			else
				Debug.LogWarning(string.Format("InspectorButton: Unable to find method {0} in {1}", eventName, eventOwnerType));
		}
	}
}
#endif
